1 /* $NetBSD: tcp_var.h,v 1.56 1998/12/18 21:38:03 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1982, 1986, 1993, 1994, 1995 42 * The Regents of the University of California. All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 73 */ 74 75 #ifndef _NETINET_TCP_VAR_H_ 76 #define _NETINET_TCP_VAR_H_ 77 78 /* 79 * Kernel variables for tcp. 80 */ 81 82 /* 83 * Tcp control block, one per tcp; fields: 84 */ 85 struct tcpcb { 86 struct ipqehead segq; /* sequencing queue */ 87 u_int t_timer[TCPT_NTIMERS]; /* tcp timers */ 88 short t_state; /* state of this connection */ 89 short t_rxtshift; /* log(2) of rexmt exp. backoff */ 90 short t_rxtcur; /* current retransmit value */ 91 short t_dupacks; /* consecutive dup acks recd */ 92 u_short t_peermss; /* peer's maximum segment size */ 93 u_short t_ourmss; /* our's maximum segment size */ 94 u_short t_segsz; /* current segment size in use */ 95 char t_force; /* 1 if forcing out a byte */ 96 u_short t_flags; 97 #define TF_ACKNOW 0x0001 /* ack peer immediately */ 98 #define TF_DELACK 0x0002 /* ack, but try to delay it */ 99 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ 100 #define TF_NOOPT 0x0008 /* don't use tcp options */ 101 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ 102 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ 103 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ 104 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ 105 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ 106 #define TF_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */ 107 #define TF_WILL_SACK 0x0800 /* try to use SACK */ 108 #define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */ 109 #define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */ 110 #define TF_REASSEMBLING 0x4000 /* we're busy reassembling */ 111 112 113 struct tcpiphdr *t_template; /* skeletal packet for transmit */ 114 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 115 LIST_ENTRY(tcpcb) t_delack; /* delayed ACK queue */ 116 /* 117 * The following fields are used as in the protocol specification. 118 * See RFC783, Dec. 1981, page 21. 119 */ 120 /* send sequence variables */ 121 tcp_seq snd_una; /* send unacknowledged */ 122 tcp_seq snd_nxt; /* send next */ 123 tcp_seq snd_up; /* send urgent pointer */ 124 tcp_seq snd_wl1; /* window update seg seq number */ 125 tcp_seq snd_wl2; /* window update seg ack number */ 126 tcp_seq iss; /* initial send sequence number */ 127 u_long snd_wnd; /* send window */ 128 tcp_seq snd_recover; /* for use in fast recovery */ 129 /* receive sequence variables */ 130 u_long rcv_wnd; /* receive window */ 131 tcp_seq rcv_nxt; /* receive next */ 132 tcp_seq rcv_up; /* receive urgent pointer */ 133 tcp_seq irs; /* initial receive sequence number */ 134 /* 135 * Additional variables for this implementation. 136 */ 137 /* receive variables */ 138 tcp_seq rcv_adv; /* advertised window */ 139 /* retransmit variables */ 140 tcp_seq snd_max; /* highest sequence number sent; 141 * used to recognize retransmits 142 */ 143 /* congestion control (for slow start, source quench, retransmit after loss) */ 144 u_long snd_cwnd; /* congestion-controlled window */ 145 u_long snd_ssthresh; /* snd_cwnd size threshhold for 146 * for slow start exponential to 147 * linear switch 148 */ 149 /* 150 * transmit timing stuff. See below for scale of srtt and rttvar. 151 * "Variance" is actually smoothed difference. 152 */ 153 short t_idle; /* inactivity time */ 154 short t_rtt; /* round trip time */ 155 tcp_seq t_rtseq; /* sequence number being timed */ 156 short t_srtt; /* smoothed round-trip time */ 157 short t_rttvar; /* variance in round-trip time */ 158 short t_rttmin; /* minimum rtt allowed */ 159 u_long max_sndwnd; /* largest window peer has offered */ 160 161 /* out-of-band data */ 162 char t_oobflags; /* have some */ 163 char t_iobc; /* input character */ 164 #define TCPOOB_HAVEDATA 0x01 165 #define TCPOOB_HADDATA 0x02 166 short t_softerror; /* possible error not yet reported */ 167 168 /* RFC 1323 variables */ 169 u_char snd_scale; /* window scaling for send window */ 170 u_char rcv_scale; /* window scaling for recv window */ 171 u_char request_r_scale; /* pending window scaling */ 172 u_char requested_s_scale; 173 u_int32_t ts_recent; /* timestamp echo data */ 174 u_int32_t ts_recent_age; /* when last updated */ 175 tcp_seq last_ack_sent; 176 177 /* SACK stuff */ 178 struct ipqehead timeq; /* time sequenced queue (for SACK) */ 179 }; 180 181 #ifdef _KERNEL 182 /* 183 * TCP reassembly queue locks. 184 */ 185 static __inline int tcp_reass_lock_try __P((struct tcpcb *)) 186 __attribute__((__unused__)); 187 static __inline void tcp_reass_unlock __P((struct tcpcb *)) 188 __attribute__((__unused__)); 189 190 static __inline int 191 tcp_reass_lock_try(tp) 192 struct tcpcb *tp; 193 { 194 int s; 195 196 s = splimp(); 197 if (tp->t_flags & TF_REASSEMBLING) { 198 splx(s); 199 return (0); 200 } 201 tp->t_flags |= TF_REASSEMBLING; 202 splx(s); 203 return (1); 204 } 205 206 static __inline void 207 tcp_reass_unlock(tp) 208 struct tcpcb *tp; 209 { 210 int s; 211 212 s = splimp(); 213 tp->t_flags &= ~TF_REASSEMBLING; 214 splx(s); 215 } 216 217 #ifdef DIAGNOSTIC 218 #define TCP_REASS_LOCK(tp) \ 219 do { \ 220 if (tcp_reass_lock_try(tp) == 0) { \ 221 printf("%s:%d: tcpcb %p reass already locked\n", \ 222 __FILE__, __LINE__, tp); \ 223 panic("tcp_reass_lock"); \ 224 } \ 225 } while (0) 226 #define TCP_REASS_LOCK_CHECK(tp) \ 227 do { \ 228 if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \ 229 printf("%s:%d: tcpcb %p reass lock not held\n", \ 230 __FILE__, __LINE__, tp); \ 231 panic("tcp reass lock check"); \ 232 } \ 233 } while (0) 234 #else 235 #define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp)) 236 #define TCP_REASS_LOCK_CHECK(tp) /* nothing */ 237 #endif 238 239 #define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp)) 240 #endif /* _KERNEL */ 241 242 /* 243 * Queue for delayed ACK processing. 244 */ 245 LIST_HEAD(tcp_delack_head, tcpcb); 246 #ifdef _KERNEL 247 extern struct tcp_delack_head tcp_delacks; 248 249 #define TCP_SET_DELACK(tp) \ 250 do { \ 251 if (((tp)->t_flags & TF_DELACK) == 0) { \ 252 (tp)->t_flags |= TF_DELACK; \ 253 LIST_INSERT_HEAD(&tcp_delacks, (tp), t_delack); \ 254 } \ 255 } while (0) 256 257 #define TCP_CLEAR_DELACK(tp) \ 258 do { \ 259 if ((tp)->t_flags & TF_DELACK) { \ 260 (tp)->t_flags &= ~TF_DELACK; \ 261 LIST_REMOVE((tp), t_delack); \ 262 } \ 263 } while (0) 264 #endif /* _KERNEL */ 265 266 /* 267 * Handy way of passing around TCP option info. 268 */ 269 struct tcp_opt_info { 270 int ts_present; 271 u_int32_t ts_val; 272 u_int32_t ts_ecr; 273 u_int16_t maxseg; 274 }; 275 276 /* 277 * Data for the TCP compressed state engine. 278 */ 279 struct syn_cache { 280 TAILQ_ENTRY(syn_cache) sc_queue; 281 u_int sc_timer; 282 u_int32_t sc_hash; 283 struct in_addr sc_src; 284 struct in_addr sc_dst; 285 tcp_seq sc_irs; 286 tcp_seq sc_iss; 287 u_short sc_rexmt_count; /* number of times SYN,ACK 288 was retransmitted */ 289 u_short sc_flags; 290 291 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 292 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 293 294 struct mbuf *sc_ipopts; /* IP options */ 295 u_int16_t sc_sport; 296 u_int16_t sc_dport; 297 u_int16_t sc_peermaxseg; 298 u_int16_t sc_ourmaxseg; 299 u_int8_t sc_request_r_scale : 4, 300 sc_requested_s_scale : 4; 301 }; 302 303 struct syn_cache_head { 304 TAILQ_HEAD(, syn_cache) sch_queue; /* time-sorted entries */ 305 LIST_ENTRY(syn_cache_head) sch_headq; /* non-empty buckets */ 306 u_short sch_length; /* # entries in bucket */ 307 }; 308 309 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 310 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 311 312 /* 313 * The smoothed round-trip time and estimated variance 314 * are stored as fixed point numbers scaled by the values below. 315 * For convenience, these scales are also used in smoothing the average 316 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 317 * With these scales, srtt has 3 bits to the right of the binary point, 318 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 319 * binary point, and is smoothed with an ALPHA of 0.75. 320 */ 321 #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */ 322 #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ 323 324 /* 325 * The initial retransmission should happen at rtt + 4 * rttvar. 326 * Because of the way we do the smoothing, srtt and rttvar 327 * will each average +1/2 tick of bias. When we compute 328 * the retransmit timer, we want 1/2 tick of rounding and 329 * 1 extra tick because of +-1/2 tick uncertainty in the 330 * firing of the timer. The bias will give us exactly the 331 * 1.5 tick we need. But, because the bias is 332 * statistical, we have to test that we don't drop below 333 * the minimum feasible timer (which is 2 ticks). 334 * This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT 335 * is the same as the multiplier for rttvar. 336 */ 337 #define TCP_REXMTVAL(tp) \ 338 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2) 339 340 /* 341 * Compute the initial window for slow start. 342 */ 343 #define TCP_INITIAL_WINDOW(iw, segsz) \ 344 (((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \ 345 ((segsz) * (iw))) 346 347 /* 348 * TCP statistics. 349 * Many of these should be kept per connection, 350 * but that's inconvenient at the moment. 351 */ 352 struct tcpstat { 353 u_long tcps_connattempt; /* connections initiated */ 354 u_long tcps_accepts; /* connections accepted */ 355 u_long tcps_connects; /* connections established */ 356 u_long tcps_drops; /* connections dropped */ 357 u_long tcps_conndrops; /* embryonic connections dropped */ 358 u_long tcps_closed; /* conn. closed (includes drops) */ 359 u_long tcps_segstimed; /* segs where we tried to get rtt */ 360 u_long tcps_rttupdated; /* times we succeeded */ 361 u_long tcps_delack; /* delayed acks sent */ 362 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 363 u_long tcps_rexmttimeo; /* retransmit timeouts */ 364 u_long tcps_persisttimeo; /* persist timeouts */ 365 u_long tcps_keeptimeo; /* keepalive timeouts */ 366 u_long tcps_keepprobe; /* keepalive probes sent */ 367 u_long tcps_keepdrops; /* connections dropped in keepalive */ 368 u_long tcps_persistdrops; /* connections dropped in persist */ 369 u_long tcps_connsdrained; /* connections drained due to memory 370 shortage */ 371 372 u_long tcps_sndtotal; /* total packets sent */ 373 u_long tcps_sndpack; /* data packets sent */ 374 u_long tcps_sndbyte; /* data bytes sent */ 375 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 376 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 377 u_long tcps_sndacks; /* ack-only packets sent */ 378 u_long tcps_sndprobe; /* window probes sent */ 379 u_long tcps_sndurg; /* packets sent with URG only */ 380 u_long tcps_sndwinup; /* window update-only packets sent */ 381 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 382 383 u_long tcps_rcvtotal; /* total packets received */ 384 u_long tcps_rcvpack; /* packets received in sequence */ 385 u_long tcps_rcvbyte; /* bytes received in sequence */ 386 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 387 u_long tcps_rcvbadoff; /* packets received with bad offset */ 388 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 389 u_long tcps_rcvshort; /* packets received too short */ 390 u_long tcps_rcvduppack; /* duplicate-only packets received */ 391 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 392 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 393 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 394 u_long tcps_rcvoopack; /* out-of-order packets received */ 395 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 396 u_long tcps_rcvpackafterwin; /* packets with data after window */ 397 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 398 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 399 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 400 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 401 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 402 u_long tcps_rcvackpack; /* rcvd ack packets */ 403 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 404 u_long tcps_rcvwinupd; /* rcvd window update packets */ 405 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 406 u_long tcps_predack; /* times hdr predict ok for acks */ 407 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 408 409 u_long tcps_pcbhashmiss; /* input packets missing pcb hash */ 410 u_long tcps_noport; /* no socket on port */ 411 u_long tcps_badsyn; /* received ack for which we have 412 no SYN in compressed state */ 413 414 /* These statistics deal with the SYN cache. */ 415 u_long tcps_sc_added; /* # of entries added */ 416 u_long tcps_sc_completed; /* # of connections completed */ 417 u_long tcps_sc_timed_out; /* # of entries timed out */ 418 u_long tcps_sc_overflowed; /* # dropped due to overflow */ 419 u_long tcps_sc_reset; /* # dropped due to RST */ 420 u_long tcps_sc_unreach; /* # dropped due to ICMP unreach */ 421 u_long tcps_sc_bucketoverflow; /* # dropped due to bucket overflow */ 422 u_long tcps_sc_aborted; /* # of entries aborted (no mem) */ 423 u_long tcps_sc_dupesyn; /* # of duplicate SYNs received */ 424 u_long tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 425 u_long tcps_sc_collisions; /* # of hash collisions */ 426 }; 427 428 /* 429 * Names for TCP sysctl objects. 430 */ 431 #define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */ 432 #define TCPCTL_SENDSPACE 2 /* default send buffer */ 433 #define TCPCTL_RECVSPACE 3 /* default recv buffer */ 434 #define TCPCTL_MSSDFLT 4 /* default seg size */ 435 #define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */ 436 #define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */ 437 #define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */ 438 #define TCPCTL_INIT_WIN 8 /* initial window */ 439 #define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */ 440 #define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */ 441 #define TCPCTL_WSCALE 11 /* RFC1323 window scaling */ 442 #define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */ 443 #define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */ 444 #define TCPCTL_CWM 14 /* Congestion Window Monitoring */ 445 #define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */ 446 #define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */ 447 #define TCPCTL_KEEPIDLE 17 /* keepalive idle time */ 448 #define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */ 449 #define TCPCTL_KEEPCNT 19 /* keepalive count */ 450 #define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */ 451 #define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */ 452 #define TCPCTL_MAXID 22 453 454 #define TCPCTL_NAMES { \ 455 { 0, 0 }, \ 456 { "rfc1323", CTLTYPE_INT }, \ 457 { "sendspace", CTLTYPE_INT }, \ 458 { "recvspace", CTLTYPE_INT }, \ 459 { "mssdflt", CTLTYPE_INT }, \ 460 { "syn_cache_limit", CTLTYPE_INT }, \ 461 { "syn_bucket_limit", CTLTYPE_INT }, \ 462 { "syn_cache_interval", CTLTYPE_INT },\ 463 { "init_win", CTLTYPE_INT }, \ 464 { "mss_ifmtu", CTLTYPE_INT }, \ 465 { "sack", CTLTYPE_INT }, \ 466 { "win_scale", CTLTYPE_INT }, \ 467 { "timestamps", CTLTYPE_INT }, \ 468 { "compat_42", CTLTYPE_INT }, \ 469 { "cwm", CTLTYPE_INT }, \ 470 { "cwm_burstsize", CTLTYPE_INT }, \ 471 { "ack_on_push", CTLTYPE_INT }, \ 472 { "keepidle", CTLTYPE_INT }, \ 473 { "keepintvl", CTLTYPE_INT }, \ 474 { "keepcnt", CTLTYPE_INT }, \ 475 { "slowhz", CTLTYPE_INT }, \ 476 { "newreno", CTLTYPE_INT }, \ 477 } 478 479 #ifdef _KERNEL 480 struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 481 struct tcpstat tcpstat; /* tcp statistics */ 482 u_int32_t tcp_now; /* for RFC 1323 timestamps */ 483 extern int tcp_do_rfc1323; /* enabled/disabled? */ 484 extern int tcp_do_sack; /* SACK enabled/disabled? */ 485 extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */ 486 extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */ 487 extern int tcp_do_newreno; /* Use the New Reno algorithms */ 488 extern int tcp_mssdflt; /* default seg size */ 489 extern int tcp_init_win; /* initial window */ 490 extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */ 491 extern int tcp_compat_42; /* work around ancient broken TCP peers */ 492 extern int tcp_cwm; /* enable Congestion Window Monitoring */ 493 extern int tcp_cwm_burstsize; /* burst size allowed by CWM */ 494 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 495 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 496 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 497 extern int tcp_syn_cache_interval; /* compressed state timer */ 498 499 extern int tcp_syn_cache_size; 500 extern int tcp_syn_cache_timeo; 501 extern struct syn_cache_head tcp_syn_cache[]; 502 extern u_long syn_cache_count; 503 504 #define TCPCTL_VARIABLES { \ 505 { 0 }, \ 506 { 1, 0, &tcp_do_rfc1323 }, \ 507 { 1, 0, &tcp_sendspace }, \ 508 { 1, 0, &tcp_recvspace }, \ 509 { 1, 0, &tcp_mssdflt }, \ 510 { 1, 0, &tcp_syn_cache_limit }, \ 511 { 1, 0, &tcp_syn_bucket_limit }, \ 512 { 1, 0, &tcp_syn_cache_interval }, \ 513 { 1, 0, &tcp_init_win }, \ 514 { 1, 0, &tcp_mss_ifmtu }, \ 515 { 1, 0, &tcp_do_sack }, \ 516 { 1, 0, &tcp_do_win_scale }, \ 517 { 1, 0, &tcp_do_timestamps }, \ 518 { 1, 0, &tcp_compat_42 }, \ 519 { 1, 0, &tcp_cwm }, \ 520 { 1, 0, &tcp_cwm_burstsize }, \ 521 { 1, 0, &tcp_ack_on_push }, \ 522 { 1, 0, &tcp_keepidle }, \ 523 { 1, 0, &tcp_keepintvl }, \ 524 { 1, 0, &tcp_keepcnt }, \ 525 { 1, 1, 0, PR_SLOWHZ }, \ 526 { 1, 0, &tcp_do_newreno }, \ 527 } 528 529 int tcp_attach __P((struct socket *)); 530 void tcp_canceltimers __P((struct tcpcb *)); 531 struct tcpcb * 532 tcp_close __P((struct tcpcb *)); 533 void *tcp_ctlinput __P((int, struct sockaddr *, void *)); 534 int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 535 struct tcpcb * 536 tcp_disconnect __P((struct tcpcb *)); 537 struct tcpcb * 538 tcp_drop __P((struct tcpcb *, int)); 539 void tcp_dooptions __P((struct tcpcb *, 540 u_char *, int, struct tcpiphdr *, struct tcp_opt_info *)); 541 void tcp_drain __P((void)); 542 void tcp_established __P((struct tcpcb *)); 543 void tcp_fasttimo __P((void)); 544 void tcp_init __P((void)); 545 void tcp_input __P((struct mbuf *, ...)); 546 u_long tcp_mss_to_advertise __P((const struct ifnet *)); 547 void tcp_mss_from_peer __P((struct tcpcb *, int)); 548 void tcp_mtudisc __P((struct inpcb *, int)); 549 struct tcpcb * 550 tcp_newtcpcb __P((struct inpcb *)); 551 void tcp_notify __P((struct inpcb *, int)); 552 u_int tcp_optlen __P((struct tcpcb *)); 553 int tcp_output __P((struct tcpcb *)); 554 void tcp_pulloutofband __P((struct socket *, 555 struct tcpiphdr *, struct mbuf *)); 556 void tcp_quench __P((struct inpcb *, int)); 557 int tcp_reass __P((struct tcpcb *, struct tcpiphdr *, struct mbuf *)); 558 int tcp_respond __P((struct tcpcb *, 559 struct tcpiphdr *, struct mbuf *, tcp_seq, tcp_seq, int)); 560 void tcp_rmx_rtt __P((struct tcpcb *)); 561 void tcp_setpersist __P((struct tcpcb *)); 562 void tcp_slowtimo __P((void)); 563 struct tcpiphdr * 564 tcp_template __P((struct tcpcb *)); 565 struct tcpcb * 566 tcp_timers __P((struct tcpcb *, int)); 567 void tcp_trace __P((int, int, struct tcpcb *, struct tcpiphdr *, int)); 568 struct tcpcb * 569 tcp_usrclosed __P((struct tcpcb *)); 570 int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 571 int tcp_usrreq __P((struct socket *, 572 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 573 void tcp_xmit_timer __P((struct tcpcb *, int)); 574 tcp_seq tcp_new_iss __P((void *, u_long, tcp_seq)); 575 576 int syn_cache_add __P((struct socket *, struct mbuf *, u_char *, 577 int, struct tcp_opt_info *)); 578 void syn_cache_unreach __P((struct ip *, struct tcphdr *)); 579 struct socket * 580 syn_cache_get __P((struct socket *so, struct mbuf *)); 581 void syn_cache_init __P((void)); 582 void syn_cache_insert __P((struct syn_cache *)); 583 struct syn_cache * 584 syn_cache_lookup __P((struct tcpiphdr *, struct syn_cache_head **)); 585 void syn_cache_reset __P((struct tcpiphdr *)); 586 int syn_cache_respond __P((struct syn_cache *, struct mbuf *, 587 register struct tcpiphdr *, long, u_long)); 588 void syn_cache_timer __P((void)); 589 590 int tcp_newreno __P((struct tcpcb *, struct tcpiphdr *)); 591 #endif 592 593 #endif /* _NETINET_TCP_VAR_H_ */ 594